Winding machine



Feb. 6,1923.

C. C. ABBOTT ET L.

WINDING MACHINE.

3 SHEETS-SHEET 1.

FIITEB MAR. 26. 1921.

[Hlllll lll Inventors Charles CJqbloof, Edward D. Tre'anor Feb. 6, 1923.. C. C. ABBOTT ET AL.

wmDlNG MACHINE.

3 SHEETS-SHEET 2.

FILED MAR. 26, 1921.

Feb. Y6, 1923. LMA/m.

C. C. ABBOTT ET AL.

WINDING MACHINE.

HLED MAR.26,1921. s SHEETS-SHEET s.

- NAW/7 Charles @fughe-Lt; i Edward DTTQEUOV Patented Felt., l5, l923h CHARLES C. ABBOTT .AND ED'W'ALD D. TREANGR, 0F l? ASSIGNGRS TO GE'JERL ELECTRIC GS11/ UNDENG MACHNE. i

Appcaton lled March 26, 1921.

To @ZZ whom it may concern Be it known thatl weS Crnxnnns C. Anno'rr and EDWARD D. Trini-inem, citizens or' the United States, residing `t Pittsfield? county ont' Berkshire, State of li/lassachusetts7 have inventedcert-ain new "and useful luiprore ments in lVinding` Machines, ot which the following; is a specification.

This inventionV relates to winding inachines, and inore particularly to machines for winding coils in flat spirals.

llVhen an electrical conductor is wound into a coil Jfor use in such apparatus as trenstorrners. for example, .it is necessary to insulate the layers of conductors trom each other with greater care than. the in li- Vidual turns, since -the electrical potential troni layer to layer is proportional to the nuinloer ot turns in each layer and also to the potential between each turn. lt each layer contains a large number ol? turns it is evident that-there may he a. very high diderence o'l potential existing; between soV4 jacentlayers.,l so that a comparatively large amount of insulation is required. 'Thus in a coil haring' a definite terai'iinai voltage applied thereto and a definite nuniher oi' turns, it there he only `a small nuinher oi.i layers the entire Voltage applied to the terminals of the coil is divided only into as sniall e. number et parts. there are layers, and the yoltagte between one turn and the turn immediately under or over it may reach a correspondingly high value. One way of reducing` the voltage, and therefore the insulation, in a coil is hy increasing` the numher of layers. ln an ordinary coil having; a rather long' cylindrical body and a shallow wilfiding` this result lis accomplished hy winding; the first `layer in a flat spiral against the end collar of the cylinder, in the manner ot clock spring, and then windine' the sucneeding` layers in the saine way so that there are a large number et layers extending' trein one end ot the spool 'flange to the other. Under such circumstances since less insulation is used. there is a correspending` inunediate improvement in the space taeter. or the ratio of useful conductor to' the entire space occupied hy the win d ing.

Attempts have been inade. to construct machines 'for winding the coils in such spirals` hut mechanical drawoacls arise Serial No.

since it is didicult to support the portions oi'f the coil that are already wound during` the winding'operation, lt is the Inain oliject of our .invention to provide such a inachine having` few parts capable of performing the necessary operations. More speciiically7 one of the objects of our invention is to proyidea proper support for the flat spirals after they wound that theyv may he held in place while the succeedinn' layers arewound; other objects and advan oi our invention will hecorne apparent us the description proceeds. I'

Forv a better uA 'lerstanding oit our invention attention is directed tc the followingspeciacation and l in which Fin-ure l is a ot ther i'nacl leeneial assemhly View ne; Fin'. 2 is a sectional View to a larger sca-le ot the top of the machine showing' in greater detailV the Vteedingg' mechanism: Fig'. il is a 1View taken troni the lett ot lllig'. 2 showing how the conductor to he wound is ted to the machine; Fig'. is a detail View showing` the contiguration of one et the presser plates between which the coil is wound; Fie'. 5 is a top plan View showi some ot' the oikleratinp; parts by ineens ot' whichthe sections ot the station ary ,iresse' plate are operated; Fie'.` (5 is a detail View sluiwina' the nozzle and cooperatu n' parts 'lor feeding` the conductor to the machine; Fig. 'T a detail sectional. View showing' the construction of ineens wherehy the Yfeed mechanism is rendered inoperatiie; Fie'. 8 is an end vien1 ot the saineg' Fig'. 9 shows vin detail a part of the machine used for determining' the` amount ot tension used for winding' the coil, and Fig. lO is a. sectional View ot' the saine device; Figs. ll, l2 and i3 show three in the process et winding' Ia coil hy thisv machina and illustrates how that part ot the coil which is already wound is supported in the machine while it is in operation. ,hese three figures are taken along' line ll. ll ot Fig. 5 and are s in the direction ot' the tufee/ws,

terrine' now more in detail to the drawi. in which like reference characters refer to like parte throughont, we show in llie'.

iclanpes 22 and and a rotatable annular presser plate Se. The conductor is wound in hat spirals7 layer upon layer between the presser plate 24 and the Cooperating presser accompanying' drawiiigs.A

i. a spool hody 21 clamped between the endl plate 25 shown in greater detail in Figs. 2, 3 and 4. 1n Fig. 1 we have shown the spool body 21 as depressed to an inoperative position against the tension of the spring 26 resting upon a flat bed casting member 27. rlhe operative position of the presser plate 24 and of the spool body 21 may be best seen by referring to Figs. 11, 12 and 13, in which there is also shown the wound portion'of a coil 28.

We pro-vide appropriate means for rotating the presser plate 24 and the -associated parts 21, 22, and 28. For doing this any source of rotary motion may be used and we show in this instance an electric motor 29 supported on the frame 80', which frame also serves as a general support for all of the parts of the machine. The motor 29 by means of belting and gearing transmits rotary vmotion to the shaft 30 to which is splined the end iianges 22 and 23, the spline permitting relative aXial movement of the spool body 21 and the shaft. The motion transmitting mechanism from the motor 29 to the shaft 30 comprises the pulleys 81 and 32, belt 83, clutch 34 and bevel gears 85 and 36. One of the faces of the clutch 34 is in this instance arranged to be moved axially of a supporting shaft 37 so as to engage the other member of the clutch by means of a foot pedal 38 and a fork 39 in the well known manner. Since it is quite immaterial where or how the rotary motion is produced, it is not considered essential to describe in greater detail the motion transmitting apparatus. Suthce it to-say that appropriate bearing members are pro vided, as well as means for oiling them, such as oil cups 40 and tubes 41 and 42.

As the coil 28 is wound, it is of course necessary that the members 22 and 23 as well as the rotatable presser plate 24 move downward axially of the shaft 30. As the coil is wound this movement takes place automatically, since the spring 26 is compressed by the downward thrust of the plate 24 as more and more layers of the coil 28 are wound. However, in order to prevent too great a compression of the spring 26 or to enable an entire coil to be wound, we provide means for lowering the plate member 27 upon which the spring 26 rests so as to reduce its compression after it has Vbeen compressed by the downward movement of the presser plate 24. For this purpose we utilize a series kof screw shafts 48 threaded through the plate 27 and mechanically connected together by means of sprocket wheels 44, one of which'is shown in Fig. 1, anda sprocket chain 45 passing around all of the sprocket wheels. Upon one of the screw shafts 43 there is provided a manually operable handle 46. Appropriate roller bear ings may be pro-vided for each of the screw shafts 43 in the top plate 47 of the frame 46, the screw shafts raise or lower the plate 27 which compresses or expands the spring 26.

n. stationary presser plate 25 is used for supporting the spirals. The bottom surface of this presser plate where it contacts with the conductor which-is being wound is made smooth enough so that very little friction is present opposing the movement of the conductor upon said surface. Such a stationary presser plate has the advantage that it is easily adjustable, is extremely simple, and the flat spiral as it is being wound has a uniform support. However, where the radial depth of the winding is considerable, a presser plate made up of a single section may not serve to support the winding very well. For this reason, presser plate 25 is made up of a plurality of sections, in this instance two sections which are indepenf dently movable toward or from the stationary presser plate 24. 1t is thus possible after a portion of any single spiral is wound to support this portionas well as the preceding layer not covered by the portion, by causing the active surfaces of the presser plate sections to be at different levels. When the layers are started, thefirst turn is thus relieved of most of the pressure of spring 26, and it may easily be wound. Referring now 'to Figs. 11, 12 and 13, this effect is clearly brought out in the various stages of the winding. Fig. 11 shows the second spiral being wound, all but the last turn of this spiral having been completed. Under such circumstances the two sections 49 and 50 of the stationary presser plate 25 are lo cated in the same plane. Fig. 12 shows the third of the spirals being wound. Under such circumstances the outer annular section 50 of the stationary presser plate 25 is depressed by appropriate mechanism to be described later. The resulting relative positions of the two sections 49 and 50 are represented in Fig. 12-and it is seen that the outer porton of the second spiral is pressed between this outer section and the rotatable presser plate 24, while the inner portion of the succeeding spiral is wound and supported by inner section 49. rllhis has the important effect of providing a winding space for the beginning of the layer without great side pressure 'on the ijrs't few turns. Were the stationary presser plate made in a single portion it would be impossible to accomplish lthis result, and it would be hard to introduce the first turns between the two presser plates. Fig. 13 shows how the inner section 49 of the stationary presser plate 25 is used to support the inner portion cf Ythe third spiral, while the fourth spiral isbeing started. For this pur'pose the section 4:9 is depressed.

rThe stationary presser plate 25 is 4appropriately supported by means of support V51 fastened to the top member l? ot the trarne 30. rThis member 5l is a ring-shaped casting, the form of which is clearly shown in Figs. 2 and 3, so as to permit the spool body 2l to pass` therethrough, as illustrated in Figs. ll, l2 andl. The sections 49 and 50 oi the stationary presser plate 25 each have series oi"- studs 52 located around a circle, said studs passing through appropriate counterbored holes 53 shown in Fig. 2 ot the support 5l. These studs have collars 54, fastened to them; and between the collars 54; and the bottom of t-he counterbore is interposed a compression spring 55. lt is evident from this description that these springs 55 acting,- under the collar 54 urge the studs 52 upwardly until the upper sure faces of the stationarypresser plate 25 Contact with the lower surface of the annular` portion 56 of the support It is also evident that by depressing` the collars 5st the springs 55 may be de pressed and the stationary presser plate 25 correspondingly moved or urged toward the rotatable presser plate`2l. rlhe depression of the collars 54 may be accomplished by any appropriate mechanism. l/Ve provide in this instance a series oil pivoted levers :T7 and 58 at one end of which screws 59 are carried, while at the other end rollers 6() are pivoted, as is clearly shown in Tfigs. 5, ll, l2 and 13. Coacting` with these rollers 60 are cams 61 and 62 which are supported. on a rotatable or oscillatable rino; 63. rEhe arrangement is such that when this ring 63 is manually rotated or oscillated by means of a handle 64. said cams 6l and 62 coact either with levers 57 or with levers 58. lf levers 57 are depressed by the rotation of ring' 63 in a clockwise direction from the position shown, which rotation causes actuation of cam 61, then the outer section 50 of the stationary presser plate is moved downward; while on the other hand it rotation of ring 63 is insuch a direction as to cause cam 62 to pass under the rollers carried by the pivoted lever 58, then the inner section i9 of the stationary presser plate 25 is depressed. rlhe cams 6l and 62 are radially dislaced from each other, as well as the rollers ou levers 57 and 58, so that each set is independently operable b v rotation ot the ring 63 from neutral. ln the present instance we use three or more levers 5S ind a corresponding number of levers 5i" which are pivoted on shafts 65 held in bosses 66 cast integral with support 51. For supporting' the rotatable or oscillatable ring' 63% we provide hollow roller bearings 67 through which pass screws 68 fastened to the support 50. as clearly shown in Figs. ll, l2

and 13. These roller bearings engage into slots cut into the ring 63. ln this way practically ifrictionless support is obtained. lin the position shown in F 5 neither of the levers 57 or 5S are rotated out of a horizontal position, since the rollers 60 are on the low portions o'f the cams 6l and 62. This 'is most clearlyseen in Fig. Rotation of the ring 63 in one direction or the other from its neutral position will, as explained before, cause rotation ot levers 57 or 58 to depress either the inner or outer section or" the stationary presser plate 25.

lt is evident that if the sections 4:9 and 50 be divided by a circular division line, thon it would be possible for the middle turn in any spiral to get stuclr in the space between the two sections and the device may not operate very satisfactorily. To obviate this difficulty we malte the line ot partition between the sections i9 and 50 non-circular. For example, we may maire the line of partition of the form shown in ll. ln this way there is no continuous space which. could accommodate any et the turns oli` spiral. It is also evident trom an inspection of Fig. 4 that there is a space 69 where the sections i9 and 50 are cut away in order to accommodate a feeding nozzle 70 through which the conductor passes as it is ted to the machine.

No employ proper means whereby the spirals are tightly wound. These means consist in so controlliinev the speed at which the conductor is 'ted to the machine that there is an apprecialine Y.torce pressing' adiacent conductors together as they are wound on the saine spiral. fllhese results :ire ob-A tained by providing means toi.' under `ile/edinp; the conductor while it is wound troni the inside of the spiral to the outside. and in providing` means 'tending to overfeed the conductor while it is wound trom the ontside ot the spiral to the inside. ln the er:A ample illustrated in ll, l2 and the first spiral is wound from the inside to the outside. llllhiie this talres place an underfeeding' is provided by passing' the conductor through a friction device which imposes Yli'rictional load upon the conductor it is pulled in by the rotation oi the presser plate 24s and the spool body 2l. The details oi* this device will be described later. ln Fin.

the nozzle 'l0 is shown as connected 'to a swinfrine bracket 7lY pivoted on a sta lonnrjf tened to the t ew 753.

l2@ t i 2. The nozizle 7() 'tas ,ret il by means of the sci shown at 7 and wl'iile tl 7l swii variation in radius.`

su bru The conductor is radius oi the tur* are wound the bi pensates tor this order to urne the nozzle 70 either inwardly or outwart y depending upon w her the spiral is wound trom the inside or the outside respectively. n tension spring 75 is pro- 13o vided. Fig. G shows how this tension spring' is used for effecting this purpose. @ne end of the spring is fastened to the swinging bracket 71 while the other end is fastened to a strap 76 pivoted to the stationary support 72 by appropriate means such as screw 77. The stationary support 72 is cut away at 7 8 as shown in Fig. 3 to provide a shoulder for the strap 76. While the wire is wound from the outside to the inside of the spiral7 the position of the spring` 75 is as shown in Fig. 6 since under such circumstances it tends to pull the nozzle out- Wardly. l/Vhen the conductor is wound from the inside to the outside, however, the strap 76 is turned about its pivot screw 77 and the spring takes on the dotted line position shown in Fig. 6 so that it urges the nozzle 7 0 inwardly.

Referring` now in greater detail to Figs. 3, 9 and 10 to show how the friction load is imposed upon the conductor 711 while it is wound from the inside of the spiral lto the outside, there is a supporting` member 79 held to the stationary support 72 by means of the stud 80 formed integrally with the member 79, and by means of the nut 81. The shoulder 82 of the support 79 is thus clamped securely against the shoulder 83 of the projection Se provided on the supr porting member 72. This supporting; member is split as by means of a saw-cut at 85 and has an aperture 86 extending' through it. A counterbore provided for the aperture accommodates a split bushing 87 of some material such Vas libre, which bushing); has an aperture 89 through it which aligns with the aperture S6 Y through the member 79. Through these apertures the conductor 741- passes. There is provided means for clamping` .the bushing 87 tightly so as to cause friction to be exerted upon the conductor 74 as it is pulled through these apertures. For this purpose the member 79 is provided with a tapped hole 99 and an aperture 90, as shown clearly in Fig. 9. A saw cut 7 9 on a level with the bottom of the counterbore and extending part way through the member 79 is provided so as to give the counterbored portion more flexibility. Tnto the tapped hole is arranged to be threaded a stud 91 to which is pivoted a hand-operated cam 92 at the point 93. lt is evident that by rotating cam 92 about its pivot 93 at right angles to the position shown in F 9 and in a countercloclrwise direction. the pressure upon .the bushing' 87 may be released. Upon reverse movement the pressure may be reapplied. Furthermore, this pressure may be controlled by using` the cam 92 as a handle for the stud 91by means of which it may be turned in or out of the threaded hole 89.

lVhile the conductor 741 is being;` wound from the outside to the inside, the bushing 87 is released and instead there is provided means tending to overfeed the conductor 74. Tn order that'this overfeeding` may serve to exert an effective axial force on the conductors, there is provided a depending flange 941- on the outer section 50 of the stationary presser plate 25. This flange acts as an abutment for the conductor 74- when the spiral is started. The very first turn which is wound in the spiral engages the inner wall of the flange 911 `and is pressed against it due to the overfeeding that has been mentioned heretofore. This first turn likewise acts as an abutment for the succeeding` turn. The overfeeding, as is evident, serves to impart an appreciable axial thrust to each succeeding` turn as it is wound on the spiral` tending to .push it outwardly against the previous turn. To provide this overfeeding there is utilized an auxiliary shaft 95, Fig. 1, driven from any appropriate source. This source may, for example, be the same as that utilized to drive the main shaft 30. As shown in Fig. 1, the rotation of' shaft 95 is obtained in this instance by means of a belt 9G connecting pulleys 97 and .I

98 respectively fastened to shafts 30 and 95. The shaft is appropriately supported in bearing 99 at its bottom and bearing- 100 at thetop. This-shaft 95 rotatesa beveled gear 101 which in turn serves to rotate the beveled gear 102.

Since the rotation of shaft 95 is made fast enough so that there is always a tendency for the conductor 711 to be overfed7 it is evident that some means must be provided whereby the excess revolutions of the shaft may be rendered ineffective. complisl'i this object there is provided a fri/tional slipping` clutch somewhere in the transmission from shaft 95 to the feed. Such a frictional slipping clutch is most clearly shown in Fig. 2 and in this instance comprises a. plurality of friction discs 103 made up of alternate layers of steel and fibre. These friction discs 103 are held in an appropriately formed shell member 10s.L splined to the shaft 105 which is fastened by means of the screw threads 106, coupling 107 and nut 108 to the drive shaft 95. Screw threads 106 and coupling member 107 serve as adjusting lmeans for the tension of the compression spring- 109'which serves to compress the friction discs 103. The member 104 has telescoped within it a hub 110 which carries the beveled gear 101. The depending ange 111 of this hub 110 engages with the uppermost of the friction discs 103 whereby al frictional drive is obtained for thegear 101. Furthermore. the hub 110 has an aperture 112 sufhciently large in diameter to clear the shaft 105, as clearly shown in Fig. 2. The bearing member for the shaft and the bearing member 113 for the shaft 11d which is fastened to the driven beveled gear 102 are appropriately formed nase-,aai

on a bracket member 115 supported upon the top member 47 of the supporting strucn ture 30.

The rotation of shaft 114 is utilized to drive the feed rolls 116 and 117. These feed rolls are shown most clearlyin Figs. 2 and 3 and carry on their outer faces some such material as fibre which serves to grip the conductor 74 While the feed rolls 116 and 117 are rotated. The feed roll 117 is connected to shaft 114, While the feed roll 116 is driven through gears 118 and 119. The latter gear is connectedto the same shaft as feed roll 116, said shaft being approw priately supported in stationary members 120 and 121 which are carried on the support 72. This support 72 also carries the bearing` members 122 and 123 for the feed roll shaft 114. The feed rolls 116 and 117 are of course so arranged that their bite comes into alignment With the place Where the conductor 74 isfed through the nozzle l70. 1t is evident from this "description that the slipping clutch-comprising Vthe friction discs 103 and the associated parts take up the excess motion which shaft 95 has over that required to supply conductor 74 to the machine.

It is essential that the feed rolls be rendered inactive except While the conductor 74 is Wound from the outside to the inside ofthe spiral. There is accordingly provided appropriate means for rendering the feed inoperative While the conductor 74 is Woundfrom the inside to, the outside. For this'purpose there is provided anveccentric supporting arrangement for shaft 124, most clearly illustrated in Figs. 2, 7 and 8. The shaft 124 to which arefastened the gear 119 and the feed roll 116 is not directly jour naled in the supports 120 and 121 but instead is carried in a member 125 through which there is bored an eccentric aperture 126 accommodating shaft 124. Counter bores 127 are provided at each end of thc aperture A126 which serve to hold ball-bearings for the shaft 124 so as to reduce the friction of the drive to a minimum. The member 125 has a turned portion 128 at each end which fit into the members 120 and 121. 1t is evident that by rotating the niember 125 thecenter of the aperture 126 mayY be made to approach the center of the shaft 114 -which carries; the feed roll 117 or to recede therefrom., since Athe aperture'126is eccen tricof the apertures in the bearing members 120. and 121. All that is necessary there fore to disconnect the] gear 119 from 116 to rotate this eccentric member 125 so as to lift the center of shaft 124 away from the center of shaft 114 and thus to disengage the two gears. To perform this function, a

handle `129 is attached to the eccentric member '125i by means of Which this eccentric member may :be rotated.v 1 spring 136 coiled aboutthe-V eccentric' member 125 is utilized.

to hold the gear 119/normally in mesh with gear 118. lt is therefore necessary to depress handle 129 and keep it depressed if it is necessary to render the feed ineffective, as for example, While the conductor 74 is wound from the inside to the outside of the spiral.

The operation of this machine may be rendered clearer by the following explanation. Assume that the first layer of the coil is Wound from the inside to the outside of the spool, and that the next layer is Wound from the outside to the inside. This order is then kept up for each succeeding pair of layers. F or the start the gear wheel 119 is held out of mesh with gear Wheel 118 so that the feed rolls 116 and 117 do not bite the conductor 74. The conductor 74 1s led through the apertures S6 and 88, through parts 79 and 87, then through the feed nozzle 70. The conductor is then in any Well known manner anchored to the spool body 21. After this is done, the tension of spring 26 is adjusted by means of raising or lowering the flat plate 27 by turning the handle 46. After this tension is properly adjusted the tension on the conductor 74 is also adjusted by means of the stud 91 which serves to cla-mp the bushing 87 through which the conductor 74 passes. 1t is evident that a variety of bushings may be used with dilferent apertures therethrough so that different diameter Wire or different shapes of cross sections may be utilized for the conductor in Winding the coil. The motor 29 is now startedV and the rotatable presser plate 24 therefore rotates and serves to pull the conductor 74. The tension` of spring 26 is sufficient to cause an appreciable pressure between the stationary Vpresser plate 25 and the rotatable presser plate 24. At the beginning of the first layer the outer section 50 of the stationary presser plate contacts With the rotatable presser plate 24,

While the inner section 49 is pushed away from the rotatable presser plate by the interposition of conductor 74. This condition is shown in Fig. 12 which shows the third layer being Wound. The winding of the third layer is exactly similar to the winding of the first layer. To cause the outer section 50 to remain in contact Withthe presser plate 24. rotatable ring 63 is oscillated by means of handle 64 in a clockwise Vdirection as viewed in Fig. 5. This has thee'ect of actuating cam 61 so that the pivoted levers 57 serve'to depress thestuds 59 connected 'to the outer section. 50. The ring 63 is rotated until there is enough space between the inner section 49 and the rotatable rpresser member 24 to accommodate the conductor 74. The depression of the outer section 50 causes a corresponding depression of the stationary presser member 24. against' the action of spring 26. When; the Erst .layer is partially wound the conductors themselves serve to separate the two presser plates and by the time halt' oli' this iirst layer is wound it is necessary to raise the outer section inforder that the winding may be continued. Under such circumstances the ring (SB is rotated back to its neutral position and the presser plate sections Lif) and are in the position shown in Fig. ll. After the first layer is wound, the second layer starts from the outside to the inside. For this purpose the clamping stud 9() is released by means of the cam 92 so that the conductor 74; does not have to pulled through the aperture S8 with any `great amount ot friction. After this is done the gear wheels lil?) and 118 are allowed to engage. '.lhis renders the feed operative and causes the conductor 74rto be led against the depending flange y94 of the outer section 50 of the stationary presser plate 25. In order to enable this second layer to be started while'at the same time the inner portion of the first layer may be supported, the inner section 49 is depressed by rotating` the ring 63 in a counterclockwise direction which causes actuation of the pivoted levers 58. rlhis has the effect of depressing the rotatable. presser plate 24 still further against the action or' spring 26. The relative position or' the 'two sections ot the stationary presser plate is shown in Fig. 13 'for this condition. It is evident that while the outer portion ot the spiral layer isy being started, the inner portion of the last turn is prevented from unraveling by the aid of the inner section lt9. Then the layer is about halt wound the section 49 may be raised by returning the ring 63 to neutral position. This condition is shown in Fig. l1 for the second turn. rlhe excess rotation of shalt 95 is taken care of in the slipping clutch shown in Fig. 2 and assists in packing each succeeding turn against the last one for this winding operation. After the second layer is wound, the third layer is started in the same. manner that the rst one was and this process is carried on vindeiinitely until the coil is completed. Cha-nging from layer to layer necessitates starting and stopping the apparatus which may be accomplished most expeditiously by means o tA the foot pedal 38 provided for controlling the clutch 34. As more and more layers are wound, it may be necessary to readjust the tension of spring 26 by lowering the V:flat plate member 27.

While there is shown in the accompanying drawings but one embodiment of the invention., it is not limited thereto and we aim to embrace in the appended claims all modiiications falling fairly within the scope of our invention.

' What we claim as new and desire to secure by Letters Patent of the United States, is,--

l. ln a machine for winding coils in flat spirals, a pair of annular presser plates between which the spirals are wound, and means for urging said plates together, one ot' said plates being made in a plurality of concentric rings. V

2. In a machine for winding coils in `dat spirals, a pair of annular presser plates between which the spirals are wound, one of said plates being made in annular portions relatively movable in a direction toward or from the other presser plate. y

3. ln a machine for winding coils in flat spirals, a rotatable annular' presser plate, means for rotating said plate, a non-rotatable presser pla-te, means tor urging said plates together, said non-rotatable presser plate being made in portions relatively movable in a direction toward or from the other presser plate, and means for feeding a conductor between said presser plates.

4f. ln a machine for-winding coils in fiat spirals, a pair of annular presser plates between which the spirals are wound, one of said plates comprising relatively movable ring sections, the line of partition between the sections being non-circular, and means for urging said plates together. v

In a machine for winding coils in fiat spirals, a rotatable presser plate, means for rotating said plate, a non-rotatable presser plate comprising relatively movable portions, means i'or urging any of said portions toward the rotatable presser plate, and means for feeding a conductor between said presser plates.

6.. ln a machine for winding coils in flat spirals, a rotatable presser plate, a non-rotatable presser plate comprising relatively movable ring sections, Vmeans for moving said sections relatively to each other, and means for pressing the winding between the plates.

7. ln a machine for winding coils in 'fiat spirals, a rotatable presser plate, a non-rotatable presser plate comprising relatively movable ring sections, pivoted levers arranged to move each ring section, and means for rotating said levers.

8. In a machine Jfor winding coils in flat spirals, a rotatable presser plate, a non-rotatable presser plate comprising relatively movable ring sections, supports for the presser plates, the sections of the non-rotatable presser plate being independently supported, and means for independently urging said sections toward the rotatable presser plate comprising pivoted levers, arranged when rotated. to depress the plate section, said pivoted levers being arranged arounda circle, a rotatable ring, cams carried by saidring, and so arranged that when the ring is rotated in one direction, one of the sections of the non-rotatable presser plate is depressed, while rotation in the other direction, causes rotation of other pivoted levers to depress another section ofthe presser plate.

9. In a machine for Winding` coils in flat spirals, a rotatable presser plate, a non-ro tatable presser plate comprising relatively movable ringV sections, an oscillatable ring, and means whereby oscillations ot said ring in one or the other direction causes certain of the non-rotatable presser plate sections to be urged toward the rotatable presser plate.

l0, In a machine for Winding,` coils in ilat spirals, a rotatable presser plate, means for rotating said plate, a non-rotatable presser plate comprising relatively movable ring sections, an oscillatable ring, cams carried by said ring' so arranged as to urge one of the sections ot the nonsrotatable plate against the rotatable plate upon rotation of the ring from a neutral position.

ll. ln a machine for Winding` coils in flat spirals, a pair of presserl plates, a compression spring urging said plates togetl'ier, a plate member supporting,- said spring, and a plurality Ot screw shafts arranged for simultaneous operation for adjusting` the position of the plate member.

l2. ln a machine 1to1.' winding coils in liat spirals, a pair of presser plates, a compression spring' urging` said plates together, a plate member supporting' said spring, a plurality ot screw shafts threaded in said plate member, sprocket Wheels on each shaft, a

common sprocket chain engaging,` said Wheels, and means `for turning one of said shafts.

ln Witness Whereoii,y We have hereunto set our hands this 23rd day o1" March, 1921.

CHARLES C. ABBOTT. EDWARD D. TREANOR. 

